Electromagnetic security

What would it take to declare the electromagnetic spectrum a domain of warfare?

Cyber was recently declared a domain of warfare five years ago, making it the fifth operational domain with land, sea, air and space. There is now also discussion of donning the electromagnetic spectrum (EMS) its own operational domain of warfare. 

As reported by Breaking Defense last year, Department of Defense Chief Information Officer Terry Halvorsen said the Pentagon will be investigating requirements and ramifications of declaring EMS a domain. In April, Air Force Maj. Gen. Sandra Finan, who at the time was serving as deputy CIO for C4 and Information Infrastructure and Capabilities at the DoD, said: “I think that spectrum operations are so important that we ought to look at declaring the electromagnetic spectrum a domain because we are going to be operating offensively and defensively across that domain.”